Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive (A Frame) - ForGe Control - Manual (Page 88)

88 Rockwell Automation Publication 7000A-UM200C-EN-P - June 2014
Chapter 3 Component Definition and Maintenance
The PowerCage must be cleaned with an all purpose household cleaner.
Apply the cleaner to a paper towel and wipe the surface of the PowerCage where
the gasket will be applied. Liberally spray the surface with distilled water. Wipe
the surface with a clean paper towel.
Apply a thin bead of Loctite 454 adhesive to the PowerCage surface in a zigzag
pattern using the original nozzle size. Use the tip to spread the adhesive around to
cover at least 50% of the area. There should be sufficient quantity of adhesive to
remain wet long enough for the gasket to be applied. The adhesive uses the
moisture in the air as it cures. The higher the humidity the faster the adhesive
will cure.
Position the gaskets ensuring the gasket is oriented correctly. The gasket should
be centered over the opening for the heatsinks with the narrow end positioned
closest to the test points. The porous surface of the gasket should be applied to
the PowerCage. The gasket will bond almost immediately. Apply some pressure
to the gasket for 15...30 seconds.
PowerCage Removal After all the gaskets have been placed check to see that the gasket has bonded
properly. Repair any loose areas.
1. Ensure there is no power to the equipment.
2. Before removing the PowerCage, all the components located within the
PowerCage need to be removed to avoid any damage to the components.
Consult the required sections to remove clamping pressure, as well as
remove the SGCT, circuit boards, and thermal sensor.
3. Remove the M8 bolts in the two flanges that connect the heatsink to the
PowerCage, then remove the heatsink from the PowerCage. This will
reduce the weight of the PowerCage making it easier to handle.
IMPORTANT Do not spray onto the PowerCage as it promotes electrical tracking.
IMPORTANT This adhesive will bond anything quickly, including fingers!
ATTENTION: To prevent electrical shock, ensure the main power has been
disconnected before working on the sensing board. Verify that all circuits are
voltage free using a hot stick or appropriate voltage-measuring device. Failure
to do so may result in injury or death.
ATTENTION: The SGCT can be destroyed or damaged by static charges.
Personnel must be properly grounded before removing circuit boards from the
PowerCage. Use of damaged circuit boards may also damage related
components. A grounding wrist strap is recommended for handling.